Calendar week ISO (PR#14132)
Why are you reporting a POSIX standard feature missing in your OS as a bug in R? (One that is even documented on the help page.) On more comprehensive OSes you can use the %V format of strftime. You could compile a replacement for Windows' strftime and link it into your build of R, as we have done for so many other Windows lacunae. Then in your example use as.integer(strftime(tmp.d, "%V"))
On Fri, 11 Dec 2009, samandrew at gmx.ch wrote:
Hi there =20 I use Gnu R sometimes at work.=20 =20 Unfortunately we use Windows and R has problems with getting the calendar
That is simply false: R is not responsible for the lack of standards compliance of Windows, and filing a bug report with Microsoft would be much more appropriate.
week number with the first week as the one which has at least 4 days. A
colleague told me that he has the same problem.=20
=20
Below you can see what I use now, for finding the right week.=20
=20
=20
Kind regards,=20
Samuel Andreas Meichtry
=20
=20
#Excel-Funktion
#=3DK=DCRZEN((A3-DATUM(JAHR(A3+3-REST(A3-2;7));1;REST(A3-2;7)-9))/7)
=20
=20
#R-Funktion
KW<-function(x){=20=20=20=20
return(floor(
as.numeric((x-(as.Date(ISOdate(
=20
as.numeric(format(as.Date(as.numeric(x)+3+25569-2-(as.numeric(x)-2+25569)%%7
,origin=3D"1900-01-01"),"%Y")),1,1)
)+((as.numeric(x)-2+25569)%%7-9)-1))/7)))=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
}
=20
tmp.d <- seq(as.Date("1970-01-01"),as.Date("2009-01-01"),"days")
df<-data.frame(TimeStamp=3Dtmp.d,KW=3DKW(tmp.d))
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